I you press CTRL-AL-F1 you can get to a text-mode console. There you can
attach gdb to kdeinit4 like this
$ gdb kdeinit4 $(pidof kdeinit4)
then gdb will be attached to the runnin kdeinit4. Now press ALT-F7 to get back
into KDE. When the crash occours press CTRL-ALT-F1 again and you will see that
gdb has catched to crash.
--
[Lucid] New bug: Plasma crash at KDE logout
https://bugs.launchpad.net/bugs/564433
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Bugs, which is subscribed to kdebase-workspace in ubuntu.